低周腐蚀疲劳自动测控系统的改进

Modification and Upgrade of the Automatic Control System for Low Cycle Corrosion Fatigue Test

针对硫化氢环境下低周腐蚀疲劳试验面临的硫化氢腐蚀、试验时间长、运行成本高难以实时测控等问题,采用高速A／D卡替代原有DH3819静态应变仪进行数据采集,采用闭环控制原理对试验中的加载进行控制,利用内部时钟作为循环周期的计时时钟,并对试验中出现的载荷、位移超出设定范围、停电丢失数据等事件,在软件中采取相应的处理方法．改进后的测控系统采集数据精度高、控制及时准确、运行安全可靠、试验成本低、可连续运行．

The low cycle corrosion fatigue test in H2S environment is challenged by the measurement system due to harsh environment, long-time test, high experimental cost, real-time measurement and control difficult. With this understanding, the system for low cycle corrosion fatigue test is modified and upgraded. A high-speed A/D card is installed in the system s computer for displacement/strain data acquisition, instead of previous DH3819 static strain gauge. The software written in Visual Basic 6.0 is employed for...